Add Review Form To Product Page Magento 1.9

You are going into the right direction, but you need to do some modifications:

1. addToParentGroup and setTitle are used to show content in review so add this code below

   <action method="addToParentGroup"><group>detailed_info</group></action>
   <action method="setTitle" translate="value"><value>Reviews</value></action>
   

2. you need to change block alias name of block type review/product_view_list to product_additional_data_review as product_additional_data alias name already exists in product.

   <block type="review/product_view_list" name="product.info.product_additional_data_review" as="product_additional_data_review" template="review/product/view/list.phtml">
       <action method="addToParentGroup"><group>detailed_info</group></action>
       <action method="setTitle" translate="value"><value>Reviews</value></action>
   
       <block type="review/form" name="product.review.form" as="review_form">
           <block type="page/html_wrapper" name="product.review.form.fields.before" as="form_fields_before" translate="label">
               <label>Review Form Fields Before</label>
               <action method="setMayBeInvisible"><value>1</value></action>
           </block>
       </block>
   </block>
   

Take the catalog.xml from default to your theme and change as follows

<catalog_product_view translate="label">
    <reference name="content">
        <block type="catalog/product_view" name="product.info" template="catalog/product/view.phtml">
            <block type="review/product_view_list" name="product.top.reviews" as="product.top.reviews" template="review/product/view/list.phtml">
                    <block type="review/form" name="product.review.form" as="review_form" />
                </block>
        </block>
    </reference>
</catalog_product_view>

and in the detail page try adding

<?php echo $this->getChildHtml('review_form') ?>